\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Show that \(f : ]0, +\infty[ \to \mathbb{R}\), \(f(x) = x + 1/x\), has a strict global minimum on \(]0, +\infty[\).
Capture an image of your work. AI teacher feedback takes approximately 10 seconds.